Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.90-2.982.67-2.73
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
Perfect on [10 1 1] three directions with angle of 74° 55
Mohs Hardness
7.5-83
2
10
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Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaCO 3Ulrich Henn and Claudio C.